Grinding-machine.



A. J OHNSTN. GBINDING MACHINE.

APrLIoATIox FILED lun. 1s, 1907.

A. JOHNSTON.

GRINDING MACHINE. APPLIoATloN FILED MAB. 1a, 1907.

A. JOHNSTON.

GRINDING IGHIIE. articulos FILED 1,111.13, 1907.

901,909.l Patented 0ct.20,19os.

F 69 612 70 sums-suur a. l

way as for ALLEN .rcnnsron or o'rrUMwa, ioWA.

` camaradas no. consce.

Specification or Letters Patent. application inea nach ia iso?. serial no. atasco.

Patentes est. so, reos.

To attacher/t it 'may concern.'

Be it known that' i, ALLEN JoHNs'ioN, a`

citizen oiv the United States, residing in Ottumwa, in the county of Wapello and State of liowa, have invented 'a new and useful lineprovement in'I'Grinding-Machines, of which the following is a specification.

This invention relates to the construction of grinding machines employing cu shaped or ring grinding wheels, and is a mo iication of and in some respects an im rovernent upon the machine shown in my atent No. 504,389 oi Se t. 5th. 1893.

l The genera ob'ect of the invention which is contained .in t e construction of the machine hereinafter described is to facilitate the grindin of iron and steel surfaces, to improve the c aracter of the work and to eiiect an economy in the operation. As in my said patent, the'cup shaped or ring grinder is supported inan inverted position sothat its rinding surface is underneath, and'the work bolder is beneath the wheel, but the Work holder instead obeingstationary is made movable and adapted to carry the' work to and fro past the grinder, and the grinder is stationary as to location, the machine in these respects being different from the patented machine.

The invention also includes a swinging actuating device for the work holder and other novel features, all of which are fully de.; scribed below vand'illustrated in the accompanying drawing forming a part of this speciiieation.

In said drawing, Figure 1 is a longitudinal section oi the invention. Figs. 2, 3, and 4 are sections on'the lines 2-2, 3 3 and 4-4 respectivelyT of Fig. 1. 5 is a detail elevation of the rack for swinging the work holder and Fig. 6 is a detail section of the device-for o erating said rack.

In sai drawing, 10 represents the main frame of the machine, andi provided with a horizontal portion or table 11 upon which the grinding'wheel or ring and its-actuating devices are su ported. The ring is` shown at 12 and it is dovetailed to a metal ring 13 which is secured to' a'disk 14 in anysuitable disk receives at its center the threaded end ci the grinder spindle-16. This spindle at its lower end is made tapering and is supported in a bearing 17 in a housing 18 resting on'the table 11. Above the tapered bearing portion of the spindle is a straight portion 19' instance, by the screws 15. Thef tical threaded opening integral therewith, and surrounded by a sleeve 20 keyed to the part 19. carries a beveled pinion 21 which meshes with another like pinion 22 on a shaft 23 carrying the fast and loose pulleys 24. Said shaft is sustained by a long bearing 25, havingdanges by which'it is bolted to the housing 18, as shown at 26. The pulleys are confined on the shaft 23 by a nut27. @n top of ythe housing 18 is a cap 28, in which the upper section of the grinder spindle 29 is ournaled, and in this cap is located a ring 30 rigid on said section 29 and conlined between upper and lower series of balls 31 and 32. The upper series of balls is arranged under a washer 33 confined in the cap by a screw plug 34 and the under series is located upon a washer 35 loose in thecap and supported by springs 340. With this construction, the u ward end thrust on the spindle is eilectua ly .resisted, and the pered part of the spindle wedged in its bearing.

At that side ofthe grinder toward the open s ace through which the work holder moves, t e grinder is provided with a shield 36 as from becoming rThis sleeveA sprlngs 340 prevent the tal shown in Fig.- 1, intended .to prevent the water-being spattered orI thrown from the wheel into said space. The frame at the to of each of the longer sides approaches close y to thegrinder, as` lainly seen at 37, Fig. 2, and each of the said) sides is rovided at thebottom with inwardly and upwardly turned flanges 370y adapted to catch the water from the wheel and conduct it to the end 38 of the v receptacle is formed machine, where a deelp and liow out'at the into which it may fa pipe 39. this portion of the frame for the removal of solid matter.

Centrally of the main frame and under the grinding wheel is located the work holder 41.` t is adapted to slide on ways 42 having depending members 43 adjustable in vertical ways formed inthe vertical pieces 44 confined between the ends of an interior frame 45 of which the anges 370 may form a part. A Wed e 46 is inserted between one of said vertice ieces 44 and the end of the frame and is a apted when the adjacent piece 44 is adjusted by the screw 47, to take u the `wear occurring between the ways and t e depending mem ers 43. The members 43 are connected by a cross brace 48 and to this cross brace is'bolted a plate 49 havinga vertherein to receive the 40 is an opening giving access tol i ladjusting screw 50 whereby the work holder is raised and lowered relative to the wheel. The screw 50 is sup orted on the hub of a pinion 51 and is keye thereto by a in 52 passing through a reduced portion `o the screw. The pinion is supportedby balls upon a base 53'and the reduced ortion of the screw is eX- tended through sai baseand provided with locking nuts 54 below the same.' The turning of the pinion to effect the adjustment of the work holder is effected by a crank 55 on a shaft 56 supported in a bracket 57 attachedto the main frame and carrying a bevel gear 58 meshing with another like gear 59 on the upper end of a shaft 60 provided at its lower en with a pinion 61 meshing with pinion 51 At 62 is a 'journal provided'with .an integral end plate 68 whereby it is secured to the said cross member 48. VUpon this journal 62 y is mounted a vibrating arm 64, the upper end whereof is vprovided with anti-friction rollers 65 which are entered in a recess 66 formed in the under side of the work holder and beend of the machine and o erate tween two angle pieces 67 bolted to the work holder. The vibrating arm has a sleeve 68 surrounding the journal 62 and on the outer crank 77. At each side o the pinion 74 are grooves 80 adapted topermit the use of any justed, a stationarily located inverted ring rollers 78 which bear upon the untoothed portions of the rack frame. By turning the shaft 75, it will be seen that the rack frame will be moved in such manner as to vibrate the arm 69 and this carriesl a like movement to the vibrating arm 64 which in turn moves the work holder to and fro relative to the grinder. Thework holder is provided with ordinary form of chuck. l

Water is 'supplied to the grinder by the p1pe490, the mouth of which discharges on top of the grinder supporting disk 14 which 1s flanged as shown sothat it is adapted to hold water whichV can only escape from it by way of a series of eccentrically locatedv assages 91 extending down though the disk. The passages 91 conduct the water tothe interror of the grinder and deliver it near the inner wall thereof, from whence the centrifugal force will carry it outward and between the lower or actin edge of the rinder and the face of the wor being ground.

A skirt 92 is attached to the work holder and extends all around the same, and de- Bends below the top edge of the flanges 370.

y meansof it I prevent access by the water with water, a U

' members 43, the vertical ways 44, t

to the working arts immediately below the table. It will a so be noted that the arms 64 and 69 and sleeve 68'orm a U shaped lever for actuating the work holder, and that the only part of it exposed to the water and grit from the grinder is the bearing or journal 62. The sleeve, however, protects this part very thoroughly.

1. The combination in a grinding machine, of a reciprocating work holding tab e, a vertical spindle stationarily located, and` a ring grinder supported by saidspindle irl an .1n-.

verted position, and having means for admitting the water through its top, of means for rotating the grinder,- a U shaped lever for actuatin the table, means for protecting the journa of said lever Jfrom the water and grit, means for supplying the grinder with water.

2. The combination in a grindin machine, of a reciprocating work holding tab e, a vertical s indle stationarily located, vand a ring grin er supported by said spindle in an inverted position, and having means for admitting the water through its top, of means for rotating the grinder, means for supplying it operated device for actuating the level'.

3. The combination in a grinding machine of a horizontal work holding table adapted to reciprocate below the-grinder, a stationarily located ring grinder supported in an inverted shaped lever pivoted at ltsv l bottom, for reciprocating the table and a hand position above the table, means for rotating the grinder, a swinging armor lever for reciprocating the table, a second `swinging arm rigidly connected to vand moving in unison with the {irst mentioned one, a rack attached to said-second arm, and extending at right an les therefrom, a pinion meshing with said rac and a shaft supported in stationary bearings and carrying said pinion'.

4.' The combination ina grinding machine, ofa horizontal work holding table adapted to reciprocate below the grinder, a support for said table whereby it may be vertically adgrinde, having waterpassages :leading from its top to its interior, a vertical spindle carrying said grinder, means for supplying water to the to of the grinder, means-for rotating the grin er, and means for reciprocating the table/ 5. kThe combination with lthe work holder table, of they slide ways 42, the de ending lic cross brace 48 connecting members 43, the adjusting screw 50, the wedge 46, the surrounding frame, and means for adjusting the ways 44 relative to the wedge.

' ALLEN JOHNSTON.

Witnesses: Y

' J. T. HAoKwoRTH,

j A. G. HARRow. 

